Landscape/Garden Design CAD/Vector/Sketchup etc

I need to find a new CAD designer to work with on my garden and landscape designs. Mostly these are 2D in colour, but I've had a few simple 3D plans done in Vectorworks and Sketchup which looked great. This all depends on the client's budget though.
A knowledge of UK/European plants would be ideal, but not essential. I have a large library of plants and tree icons that you can use. The most important thing is that we can work quickly and efficiently. And enjoy it too!
I have been designing gardens for 27yrs and have some interesting projects in the UK and occasionally in other countries. I like to work via Skype so that we can use the 'share scree' facility and can work on a plan together (usually in 2-4hr slots). This allows me to give immediate feedback and keeps clear lines of communication.
I'm attaching examples of the sort of drawings that I currently send to clients, plus a couple that I would like to aim at producing.
Excellent English language is essential please.
I look forward to hearing from you, I have a large project to start asap!